LTC6101HV Linear Technology, LTC6101HV Datasheet - Page 8

• Manufacturer Part Number: LTC6101HV
• Description: High-Side Current Sense Amplifier
• Manufacturer: Linear Technology

PI FU CTIO S
BLOCK DIAGRA
LTC6101/LTC6101HV
The LTC6101 high side current sense amplifier (Figure 1)
provides accurate monitoring of current through a user-
selected sense resistor. The sense voltage is amplified by
a user-selected gain and level shifted from the positive
power supply to a ground-referred output. The output
signal is analog and may be used as is or processed with
an output filter.
Theory of Operation
An internal sense amplifier loop forces IN
same potential as IN
8
OUT (Pin 1): Current Output. OUT (Pin 1) will source a
current that is proportional to the sense voltage into an
external resistor.
V
Operation).
IN
3) to the same potential as IN
from V
V
(Figure 1).
APPLICATIO S I FOR ATIO
SENSE
–
–
U
(Pin 2): Negative Supply (or Ground for Single-Supply
(Pin 3): The internal sense amplifier will drive IN
+
is the voltage developed across the external R
to IN
U
–
I
LOAD
sets the output current I
L
O
A
D
U
U
+
. Connecting an external resistor,
–
R
V
U
W
SENSE
SENSE
+
Figure 1. LTC6101/LTC6101HV Block Diagram and Typical Connection
(Pin 4). A resistor (R
+
R
IN
W
3
4
LTC6101/LTC6101HV
IN
IN
OUT
–
+
= V
–
5k
5k
to have the
SENSE
U
IN
–
SENSE
) tied
/R
(Pin
10V
IN
.
–
+
IN
sense resistor, either directly or through a resistor.
V
through this pin. The circuit may be configured so that
the LTC6101 supply current is or is not monitored along
with the system load current. To monitor only system
load current, connect V
sense resistor. To monitor the total current, including the
LTC6101 current, connect V
the sense resistor.
R
is the same as the sense voltage across R
sponding current, V
high impedance inputs of the sense amplifier will not
conduct this input current, so it will flow through an
internal MOSFET to the output pin.
The output current can be transformed into a voltage by
adding a resistor from OUT to V
then V
+
IN
+
(Pin 5): Positive Supply Pin. Supply current is drawn
5
2
, between IN
(Pin 4): Must be tied to the system load end of the
V
V
+
–
O
V
BATTERY
10V
= V
–
+ I
–
OUT
OUT
and V
6101 BD
1
SENSE
• R
+
OUT
+
I
OUT
forces a potential across R
to the more positive side of the
/R
R
.
OUT
IN
+
V
OUT
to the more negative side of
, will flow through R
= V
–
. The output voltage is
SENSE
x
R
R
OUT
IN
SENSE
. A corre-
IN
IN
. The
6101fa
that